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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7bdd23170d14e81fe00ccf32524c459928a156343b0c4422de05fed73e5dd1d1' 
  AND token = 'F5BJA4VJZIQfIX/olADDU4nTlgtf6CyUb8P70FI5p8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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