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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1a520d3d45ff16630b655ba3232a0de37e2d9af3fb30313cc4352a38fbd3041e' 
  AND token = '8brUr4+XO6neXWAGvHkzL+heqNAAHHOWaghnTeQL/EA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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