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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7a90d16e817349790e8e2fdb6f34957e7d2778b65f0b5985f28430087b67dd55' 
  AND token = 'RI2ERjoLbUAc0EjdUDz/DyljdYP9IJfj6wpJNu1Lh3k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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