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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f763321aa01ac5a6594dbb3cc11db5e368b01bbb14e2bb5e08d947761b786b3a' 
  AND token = 'QBFMYFUeUlch8bwILJTXeYdFSrAC+4s0ayRyWcfoKks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}