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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ca2c6b8a9f022d559afd65ef32dd3727bc76d0744e8535ceab7da94437ac88f1' 
  AND token = 'LDbaZKFl4rK0WZ3JD2SaBepvEoNt4f+DX+1deB2PdYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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