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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8e404f2d54360bb8b1911d2ca06fa5d8499894818f470b92523551dfa7da4997' 
  AND token = 'ArAQ5sVqDgd59Mep5jtnZ2iN3Wei38pdkktNaR0K9tQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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