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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cd5942fc23753c113e151758076efeaad8ab25a193efa41164e588352011a1ce' 
  AND token = 'LFv6RTWhSWy/MliENI6Rmhee1P71yBdzTUIocfTIkJ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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