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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8f4c6da047e632c8a4be4a832c8ad9222e30a749ea5487e109e12a3b147382ef' 
  AND token = 'CHeKmePeBWLoz8V+QV832o1+VysoI1LQpGpjPYrQ7AE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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