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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b5c4952db0034409f30b3faf6f80debfeff46b1a83352eca3506bc48bbee723d' 
  AND token = 'ugfvkgS0gN6f26uhdTVMUxdWfKugRhzX4i0gc7a/hFE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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