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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'eeb1f1582769104471f13470fb555d54e653f17c61a3e4e1e1e7f81e132e1a04' 
  AND token = 'RZ9C78xksWCqDQZfmrmRYsA/TpGLNI3vpIKemKHrHP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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