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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2de06548e9676fb4849cb70cc93e4a873471c027ac8f05929959e191f4bb0bf3' 
  AND token = 'rtR8RTujvgCx2Udy8sLJYU8VuynlrCm9t6iKbkQAGxM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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