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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '51644d1c429ce028197fafa3e349bacf3a31e2965fdf2e0482988e9d41ae9446' 
  AND token = 'eQqqqa1vLRDuZ+fUyj8neKdX3af6EzzQveWXXe4sc+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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