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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bd31d44147cb327287614151f38d812c0aa2980e71087d8c88d2e53f924bb03a' 
  AND token = '3f72mu/KqvbtUEYxVAcm4tnLha3RQKcOQ6mDDCMDtwY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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