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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c566b9761d8f314834008a0d85a3acd8f12ca106635630d05a854bb27c5dc299' 
  AND token = 'EpDG7XDZJvQpNblsSjo3tK7INhoH1beok6tWIX+Tn0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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