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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aa2e71744dcad76eb1ac2516452e0572a013a4d8f97752533c888ec859ecae84' 
  AND token = 'lwnnZhiuHeK1UxBm9igtxB2Ne6Co+ttnLoJdVCWQFFg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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