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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7b26a94875ef4a38782a051c3d3a3657fb66b7f667983c6fe508d13ceb978027' 
  AND token = '+TqekeE+dEAbVSS2eoGWLnpDx4VrvLL9sNCwfFsvd6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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