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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b7c59eb71ca0e50b401cef99b782607c23ab748b916072b2201960fb2070b2a5' 
  AND token = 'PBjQzahHdfs92s1p7L+8YgAvAsf2K+138cZnFEWdUHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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