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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1b00f68cc963de864c94532a5c8d6d6f6b4fee0d3ad535b2c8f2c76588a676cb' 
  AND token = 'hfPvI74bC/oqYMcG6sW2WUO2TPjdiqDnXuscKHtRXOQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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