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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a31403c13ba3e4cc6ded5a003c617cc2c43cc140fa2e51417e7a1945e6d1e60e' 
  AND token = 'CwS4qrjE0LYldQZ1PcdypnB2hVMKs+3ZCVNCbLKl2Tk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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