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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a75deaf54b11819331f8d36701cc86e6d6ba0f6d5379277da47a65e1ce2e20c3' 
  AND token = 'giOAcqXQGm73egoE6RWFhTBqTFs6JaOoGasGC2PqcyE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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